It is hard to communicate an idea for a new song without the help of the full band.
When you play the basic idea on one instrument to someone else, that person misses the context that it is in your head: the result a few bland chords in an obvious sequence.
The same can happen to you. You had that brilliant idea, but when you get back to your note book the next day, the scribbles sound like a few bland chords in an obvious sequence.
The same is true for your presentation. Your audience is missing the context that is in your head, and the slides / your story is the only thing they can rely on.
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